It’s hard to believe but “olive oil” only means that there has to be some olive oil in the bottle. “Virgin olive oil” means that all the oil is olive oil. Don’t ask me. Ask the FDA..... the same people who allow monosodiumglutamate to be called “natural flavoring”.
U.S. Extra Virgin Olive Oil for oil with excellent flavor and odor and free fatty acid content of 0.8g per 100g;
U.S. Virgin Olive Oil for oil reasonably good flavor and odor and free fatty acid content of not more than 2g per 100g;
U.S. Virgin Olive Oil Not Fit For Human Consumption Without Further Processing is a virgin oil of poor flavor and odor;
U.S. Olive Oil is an oil mix of both virgin and refined oils;
U.S. Refined Olive Oil is an oil made from refined oils with some restrictions on the processing;
These grades are voluntary. Certification is available from the USDA on a fee-for-service basis.